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In terms of cost to institute this, the upfront cost to build classrooms, to accommodate this kind of structure, we need two classrooms that hold 170 students a piece to do this.
关于建这个项目的成本，最主要的就是搭建教室，使之适应这种教学模式，我们需要两间能装170人,的教室来上这种课。
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Right, we had one from each atom, so that means we need a total of two in our molecular orbital.
对吧，每个原子有一个电子，这意味着在分子轨道里我们一共需要两个电子。
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If we're going to write programs, we need at least two things: we need some representation for fundamental data.
如果我们要去写程序，我们需要至少两件事情：,我们需要一些能代表基础数据的东西。
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We need to choose the one or two that are really going to drive and sustain the network and the service and the product As an editor, I am effectively just the chief editor of the company.
我需要选择那一件或两件,会真的带动这个网络，服务，产品,让它们持续发展的事情,拿编辑打比方，我就是公司有效率的总编。
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Why don't we go ahead for those of you who need a bit of a rest bit, let's take a two minute break and we'll resume with just some final thoughts on 50.
好吧我们先休息两分钟,然后再重新回到课上来,再讲一下对于这门课的一些最终的想法。
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If we're going to have a way to decide between these two theories, it seems as though we need some other kind of arguments.
如果我们非要找个方法在两个理论之间取舍，那看来我们需要别的论据。
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Fifty-two of you so far, so what we need are more people to get clickers, because some of these polls will be interesting to do.
目前为止有五十二个人,我需要更多的人能有个表决器,因为这样的投票会很有意思
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I'd like you to keep in mind that these two categories of purposes, both the explicate and the implicit, are something that we need to be responsible for whatever we do as designers of educational situations.
我希望你们记住,这两种教育目标，即表层目标和深层目标，是我们在对教育情境,进行设计时,必须考虑到的内容。
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So those are the last two things we really need to do.
这是我们今天需要做的最后两件事。
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Now, I want to ask a question that we're going to need to think about, the two of you sitting up front here, when I was asking you how you responded to it. Can we have a moral response to this novel?
现在，我想要问你们一个我们将要思考的问题，就你们俩吧，坐在前面的，当我问你们如何回应,我们可以对这部小说有一个道德反思吗？
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That's why all these arguments that we all get into these days about third-party political candidates what do we really need in our political culture, what would break apart the stagnation of our two-party system, if that's what people want or put more directly, will Michael Bloomberg run or not?
这就是我们今天为何面对这些争论,关于第三方党派的候选人,也就是我们的政治文化中究竟需要什么,什么能打破我们两党制停滞不前的现状呢,如果这是人民所愿,或者更直接的说,迈克尔.布隆伯格的做法行得通吗
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Going forward I like to talk with you about health reforms Talk about two aspects of reform one what do you think are the most important reforms that we as a nation need Secondly what is politically and socially feasible doable, achievable?
接着说,我想跟你聊聊医疗改革,谈谈改革的两个方面,一方面，您认为,我们国家,最需要进行改革的是什么,其次，从政治方面,和社会方面而言,什么是可行的,可做的，可是实现的？
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Because step five is that we need to fill in our bonding electrons, and we start it with filling in two electrons per bond.
因为第五步要做的是将我们的成键电子填在这，所以我们开始在每个键处填上两个电子。
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If we want to talk about two hydrogen atoms, then we just need to double that, so that's going to be negative 2 6 2 4 kilojoules per mole that we're talking about in terms of a single hydrogen atom.
而要讨论两个氢原子，我们只需要把它乘以二，因此应该是负的，2624，千焦每摩尔,这就是单个的氢原子的情况。
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So I said that we want to be talking about valence electrons here, so that means if we're talking about, for example, the octet rule for an f f molecule where we have two fluorine atoms, we need to write the valence electrons as dots around them.
我说过我们在这要讨论的是价电子，这就意味着，如果我们要讨论，比如，关于两个氟原子组成的分子的八隅体规则,我们首先需要把价电子画成围绕在它们周围的点。
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For our step two, what we need is number of valence electrons.
我们的第二步，需要知道价电子的个数。
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If you think about what happens when we go from hydrogen to helium, now instead of one electron, we have to describe two electrons, so now we have six position variables that we need to plug into our Schrodinger equation.
如果你们考虑,当我们从氢到氦会发生些什么，现在我们不是要描述一个电子，我们将要描述两个电子，所有我们现在将有6个位置变量,需要加入至薛定谔方程。
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But we've been so completely socialized into thinking two things: one is that we need water with us all the time; and second we have to buy it.
但如今我们都对以下两个观念习以为常了,第一是我们每时每刻都需要水,第二是我们要花钱买水
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It's kind of ironic that we put this in the same lecture as we talk about atomic radii, which we also call r, but they're two different r's, so you need to keep them separated in terms of what you're talking about.
有点讽刺的是,我们在同一堂课里还讨论过了原子半径，它也是用，r，表示的，但是它们具有不同的意义，因此大家需要注意区分它们,弄清楚我们讨论的是哪一个。
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So we actually only need two electrons to fill up the valence shell of hydrogen, remember that's because all we need to fill up is the 1 s.
我们其实只需要两个电子,就可以将氢的价壳层排满，要记得这是因为我们只需要排满，1，s，轨道。
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